I was scrolling my route this morning to get it in the cache. I found lots of areas along the route with missing map data. It doesn't appear segment related I am actually seeing squares with no map or nav data just clear squares. They appear at max zoom and two clicks out, at three clicks out the road data fills in, at 5 clicks out the navigation line fills in.

I did a wipe, I think (I deleted the waze folder off my phone) and installed 3.5.1.4 and still am having this problem. It's better now with the update from 3.5, but I still have a problem with small squares that don't show up at the closer zoom levels.

(1) Map tiles in the live map have corruption that causes them not to download to the current client version(2) The current live map tile generation process only generates new tiles when changes have been made.(3) If you edit the area where the problem is occurring, it will force a rebuild of the affected tiles and fix the problem.

edit the geometry of the affected road

If the area is locked above your level, (1)draw in a new road. (2) save. (3) delete the road. (4) save again (I waited for the live map to be updated before steps 3 and 4 - others I've talked to did all 4 steps at once)

This problem was solved with a patch back at the end of December. There's nothing that could have been done in the editor end that could fix it (although your theory about what makes tiles upload is correct).